Investigating officer, Detective Inspector Dave Turton of Reading CID said: "This was a nasty attack, which has understandably left the victim traumatised.

"Fortunately such attacks are very rare in the area but if anyone has any concerns or information about this incident we would ask them to call us on 101.

"There are currently officers at the scene of the crime as we continue our investigation.

"We would urge anyone who was in the area in the early hours of this morning and heard a woman in distress or saw two men running in the park area to contact us a matter of urgency on our non-emergency number 101."

If you don't want to speak directly to the police contact Crimestoppers anonymously on 0800 555 111.